Your model Pentek UVS-110-2 uses the 163518 Pentek 163518 UV System Teflon Sleeve The Pentek 163518 UV System Teflon Sleeve is a replacement teflon sleeve for the Pentek Model UV-100 and UVS-110 ultraviolet water filtration systems, as well as UV systems from Ametek, American Plumber, and US Filter. This Pentek UV system teflon s

Your model Pentek UVS-110-2 uses the 163538 Pentek O-ring Kit for Quartz Sleeve for UVS-110 The Pentek 163538 is the correct replacement for the following SlimLine water filtration systems:
Pentek UVS-110-1
Pentek UVS-110-2
The Pentek O-ring Kit for Quartz Sleeve for UVS-110 prevents water from leaking around the quartz sleeve. This